Disclosed is a smoke gas harmful ingredient purification device, which belongs to the smoke purification technique field. The utility model comprises a purification unit body of a bag-type duster, and a filtering layer is positioned on the end face of the purification unit body. The structure is characterized in that the end face of the purification unit body and the filtering layer are connected with an adsorption layer, and the filtering layer or the adsorption layer are fixed on the end face of the purification unit body by a retaining latch. The adsorption layer is connected at the inner circle or the outer circle of the filtering layer. Compared with the prior art, the utility model has advantages of reasonable design, compact structure, little resistance, low cost, safe and reliable running and easy modification to the current device. The utility model effectively solves the problem of low micro harmful ingredient removal efficiency of the present smoke purification system and the device.